1 // SPDX-License-Identifier: GPL-2.0-or-later 2 /******************************************************************************* 3 * Filename: target_core_xcopy.c 4 * 5 * This file contains support for SPC-4 Extended-Copy offload with generic 6 * TCM backends. 7 * 8 * Copyright (c) 2011-2013 Datera, Inc. All rights reserved. 9 * 10 * Author: 11 * Nicholas A. Bellinger <nab@daterainc.com> 12 * 13 ******************************************************************************/ 14 15 #include <linux/slab.h> 16 #include <linux/spinlock.h> 17 #include <linux/list.h> 18 #include <linux/configfs.h> 19 #include <linux/ratelimit.h> 20 #include <scsi/scsi_proto.h> 21 #include <asm/unaligned.h> 22 23 #include <target/target_core_base.h> 24 #include <target/target_core_backend.h> 25 #include <target/target_core_fabric.h> 26 27 #include "target_core_internal.h" 28 #include "target_core_pr.h" 29 #include "target_core_ua.h" 30 #include "target_core_xcopy.h" 31 32 static struct workqueue_struct *xcopy_wq = NULL; 33 34 static sense_reason_t target_parse_xcopy_cmd(struct xcopy_op *xop); 35 36 static int target_xcopy_gen_naa_ieee(struct se_device *dev, unsigned char *buf) 37 { 38 int off = 0; 39 40 buf[off++] = (0x6 << 4); 41 buf[off++] = 0x01; 42 buf[off++] = 0x40; 43 buf[off] = (0x5 << 4); 44 45 spc_parse_naa_6h_vendor_specific(dev, &buf[off]); 46 return 0; 47 } 48 49 struct xcopy_dev_search_info { 50 const unsigned char *dev_wwn; 51 struct se_device *found_dev; 52 }; 53 54 static int target_xcopy_locate_se_dev_e4_iter(struct se_device *se_dev, 55 void *data) 56 { 57 struct xcopy_dev_search_info *info = data; 58 unsigned char tmp_dev_wwn[XCOPY_NAA_IEEE_REGEX_LEN]; 59 int rc; 60 61 if (!se_dev->dev_attrib.emulate_3pc) 62 return 0; 63 64 memset(&tmp_dev_wwn[0], 0, XCOPY_NAA_IEEE_REGEX_LEN); 65 target_xcopy_gen_naa_ieee(se_dev, &tmp_dev_wwn[0]); 66 67 rc = memcmp(&tmp_dev_wwn[0], info->dev_wwn, XCOPY_NAA_IEEE_REGEX_LEN); 68 if (rc != 0) 69 return 0; 70 71 info->found_dev = se_dev; 72 pr_debug("XCOPY 0xe4: located se_dev: %p\n", se_dev); 73 74 rc = target_depend_item(&se_dev->dev_group.cg_item); 75 if (rc != 0) { 76 pr_err("configfs_depend_item attempt failed: %d for se_dev: %p\n", 77 rc, se_dev); 78 return rc; 79 } 80 81 pr_debug("Called configfs_depend_item for se_dev: %p se_dev->se_dev_group: %p\n", 82 se_dev, &se_dev->dev_group); 83 return 1; 84 } 85 86 static int target_xcopy_locate_se_dev_e4(const unsigned char *dev_wwn, 87 struct se_device **found_dev) 88 { 89 struct xcopy_dev_search_info info; 90 int ret; 91 92 memset(&info, 0, sizeof(info)); 93 info.dev_wwn = dev_wwn; 94 95 ret = target_for_each_device(target_xcopy_locate_se_dev_e4_iter, &info); 96 if (ret == 1) { 97 *found_dev = info.found_dev; 98 return 0; 99 } else { 100 pr_debug_ratelimited("Unable to locate 0xe4 descriptor for EXTENDED_COPY\n"); 101 return -EINVAL; 102 } 103 } 104 105 static int target_xcopy_parse_tiddesc_e4(struct se_cmd *se_cmd, struct xcopy_op *xop, 106 unsigned char *p, unsigned short cscd_index) 107 { 108 unsigned char *desc = p; 109 unsigned short ript; 110 u8 desig_len; 111 /* 112 * Extract RELATIVE INITIATOR PORT IDENTIFIER 113 */ 114 ript = get_unaligned_be16(&desc[2]); 115 pr_debug("XCOPY 0xe4: RELATIVE INITIATOR PORT IDENTIFIER: %hu\n", ript); 116 /* 117 * Check for supported code set, association, and designator type 118 */ 119 if ((desc[4] & 0x0f) != 0x1) { 120 pr_err("XCOPY 0xe4: code set of non binary type not supported\n"); 121 return -EINVAL; 122 } 123 if ((desc[5] & 0x30) != 0x00) { 124 pr_err("XCOPY 0xe4: association other than LUN not supported\n"); 125 return -EINVAL; 126 } 127 if ((desc[5] & 0x0f) != 0x3) { 128 pr_err("XCOPY 0xe4: designator type unsupported: 0x%02x\n", 129 (desc[5] & 0x0f)); 130 return -EINVAL; 131 } 132 /* 133 * Check for matching 16 byte length for NAA IEEE Registered Extended 134 * Assigned designator 135 */ 136 desig_len = desc[7]; 137 if (desig_len != 16) { 138 pr_err("XCOPY 0xe4: invalid desig_len: %d\n", (int)desig_len); 139 return -EINVAL; 140 } 141 pr_debug("XCOPY 0xe4: desig_len: %d\n", (int)desig_len); 142 /* 143 * Check for NAA IEEE Registered Extended Assigned header.. 144 */ 145 if ((desc[8] & 0xf0) != 0x60) { 146 pr_err("XCOPY 0xe4: Unsupported DESIGNATOR TYPE: 0x%02x\n", 147 (desc[8] & 0xf0)); 148 return -EINVAL; 149 } 150 151 if (cscd_index != xop->stdi && cscd_index != xop->dtdi) { 152 pr_debug("XCOPY 0xe4: ignoring CSCD entry %d - neither src nor " 153 "dest\n", cscd_index); 154 return 0; 155 } 156 157 if (cscd_index == xop->stdi) { 158 memcpy(&xop->src_tid_wwn[0], &desc[8], XCOPY_NAA_IEEE_REGEX_LEN); 159 /* 160 * Determine if the source designator matches the local device 161 */ 162 if (!memcmp(&xop->local_dev_wwn[0], &xop->src_tid_wwn[0], 163 XCOPY_NAA_IEEE_REGEX_LEN)) { 164 xop->op_origin = XCOL_SOURCE_RECV_OP; 165 xop->src_dev = se_cmd->se_dev; 166 pr_debug("XCOPY 0xe4: Set xop->src_dev %p from source" 167 " received xop\n", xop->src_dev); 168 } 169 } 170 171 if (cscd_index == xop->dtdi) { 172 memcpy(&xop->dst_tid_wwn[0], &desc[8], XCOPY_NAA_IEEE_REGEX_LEN); 173 /* 174 * Determine if the destination designator matches the local 175 * device. If @cscd_index corresponds to both source (stdi) and 176 * destination (dtdi), or dtdi comes after stdi, then 177 * XCOL_DEST_RECV_OP wins. 178 */ 179 if (!memcmp(&xop->local_dev_wwn[0], &xop->dst_tid_wwn[0], 180 XCOPY_NAA_IEEE_REGEX_LEN)) { 181 xop->op_origin = XCOL_DEST_RECV_OP; 182 xop->dst_dev = se_cmd->se_dev; 183 pr_debug("XCOPY 0xe4: Set xop->dst_dev: %p from destination" 184 " received xop\n", xop->dst_dev); 185 } 186 } 187 188 return 0; 189 } 190 191 static int target_xcopy_parse_target_descriptors(struct se_cmd *se_cmd, 192 struct xcopy_op *xop, unsigned char *p, 193 unsigned short tdll, sense_reason_t *sense_ret) 194 { 195 struct se_device *local_dev = se_cmd->se_dev; 196 unsigned char *desc = p; 197 int offset = tdll % XCOPY_TARGET_DESC_LEN, rc; 198 unsigned short cscd_index = 0; 199 unsigned short start = 0; 200 201 *sense_ret = TCM_INVALID_PARAMETER_LIST; 202 203 if (offset != 0) { 204 pr_err("XCOPY target descriptor list length is not" 205 " multiple of %d\n", XCOPY_TARGET_DESC_LEN); 206 *sense_ret = TCM_UNSUPPORTED_TARGET_DESC_TYPE_CODE; 207 return -EINVAL; 208 } 209 if (tdll > RCR_OP_MAX_TARGET_DESC_COUNT * XCOPY_TARGET_DESC_LEN) { 210 pr_err("XCOPY target descriptor supports a maximum" 211 " two src/dest descriptors, tdll: %hu too large..\n", tdll); 212 /* spc4r37 6.4.3.4 CSCD DESCRIPTOR LIST LENGTH field */ 213 *sense_ret = TCM_TOO_MANY_TARGET_DESCS; 214 return -EINVAL; 215 } 216 /* 217 * Generate an IEEE Registered Extended designator based upon the 218 * se_device the XCOPY was received upon.. 219 */ 220 memset(&xop->local_dev_wwn[0], 0, XCOPY_NAA_IEEE_REGEX_LEN); 221 target_xcopy_gen_naa_ieee(local_dev, &xop->local_dev_wwn[0]); 222 223 while (start < tdll) { 224 /* 225 * Check target descriptor identification with 0xE4 type, and 226 * compare the current index with the CSCD descriptor IDs in 227 * the segment descriptor. Use VPD 0x83 WWPN matching .. 228 */ 229 switch (desc[0]) { 230 case 0xe4: 231 rc = target_xcopy_parse_tiddesc_e4(se_cmd, xop, 232 &desc[0], cscd_index); 233 if (rc != 0) 234 goto out; 235 start += XCOPY_TARGET_DESC_LEN; 236 desc += XCOPY_TARGET_DESC_LEN; 237 cscd_index++; 238 break; 239 default: 240 pr_err("XCOPY unsupported descriptor type code:" 241 " 0x%02x\n", desc[0]); 242 *sense_ret = TCM_UNSUPPORTED_TARGET_DESC_TYPE_CODE; 243 goto out; 244 } 245 } 246 247 switch (xop->op_origin) { 248 case XCOL_SOURCE_RECV_OP: 249 rc = target_xcopy_locate_se_dev_e4(xop->dst_tid_wwn, 250 &xop->dst_dev); 251 break; 252 case XCOL_DEST_RECV_OP: 253 rc = target_xcopy_locate_se_dev_e4(xop->src_tid_wwn, 254 &xop->src_dev); 255 break; 256 default: 257 pr_err("XCOPY CSCD descriptor IDs not found in CSCD list - " 258 "stdi: %hu dtdi: %hu\n", xop->stdi, xop->dtdi); 259 rc = -EINVAL; 260 break; 261 } 262 /* 263 * If a matching IEEE NAA 0x83 descriptor for the requested device 264 * is not located on this node, return COPY_ABORTED with ASQ/ASQC 265 * 0x0d/0x02 - COPY_TARGET_DEVICE_NOT_REACHABLE to request the 266 * initiator to fall back to normal copy method. 267 */ 268 if (rc < 0) { 269 *sense_ret = TCM_COPY_TARGET_DEVICE_NOT_REACHABLE; 270 goto out; 271 } 272 273 pr_debug("XCOPY TGT desc: Source dev: %p NAA IEEE WWN: 0x%16phN\n", 274 xop->src_dev, &xop->src_tid_wwn[0]); 275 pr_debug("XCOPY TGT desc: Dest dev: %p NAA IEEE WWN: 0x%16phN\n", 276 xop->dst_dev, &xop->dst_tid_wwn[0]); 277 278 return cscd_index; 279 280 out: 281 return -EINVAL; 282 } 283 284 static int target_xcopy_parse_segdesc_02(struct se_cmd *se_cmd, struct xcopy_op *xop, 285 unsigned char *p) 286 { 287 unsigned char *desc = p; 288 int dc = (desc[1] & 0x02); 289 unsigned short desc_len; 290 291 desc_len = get_unaligned_be16(&desc[2]); 292 if (desc_len != 0x18) { 293 pr_err("XCOPY segment desc 0x02: Illegal desc_len:" 294 " %hu\n", desc_len); 295 return -EINVAL; 296 } 297 298 xop->stdi = get_unaligned_be16(&desc[4]); 299 xop->dtdi = get_unaligned_be16(&desc[6]); 300 301 if (xop->stdi > XCOPY_CSCD_DESC_ID_LIST_OFF_MAX || 302 xop->dtdi > XCOPY_CSCD_DESC_ID_LIST_OFF_MAX) { 303 pr_err("XCOPY segment desc 0x02: unsupported CSCD ID > 0x%x; stdi: %hu dtdi: %hu\n", 304 XCOPY_CSCD_DESC_ID_LIST_OFF_MAX, xop->stdi, xop->dtdi); 305 return -EINVAL; 306 } 307 308 pr_debug("XCOPY seg desc 0x02: desc_len: %hu stdi: %hu dtdi: %hu, DC: %d\n", 309 desc_len, xop->stdi, xop->dtdi, dc); 310 311 xop->nolb = get_unaligned_be16(&desc[10]); 312 xop->src_lba = get_unaligned_be64(&desc[12]); 313 xop->dst_lba = get_unaligned_be64(&desc[20]); 314 pr_debug("XCOPY seg desc 0x02: nolb: %hu src_lba: %llu dst_lba: %llu\n", 315 xop->nolb, (unsigned long long)xop->src_lba, 316 (unsigned long long)xop->dst_lba); 317 318 if (dc != 0) { 319 xop->dbl = get_unaligned_be24(&desc[29]); 320 321 pr_debug("XCOPY seg desc 0x02: DC=1 w/ dbl: %u\n", xop->dbl); 322 } 323 return 0; 324 } 325 326 static int target_xcopy_parse_segment_descriptors(struct se_cmd *se_cmd, 327 struct xcopy_op *xop, unsigned char *p, 328 unsigned int sdll, sense_reason_t *sense_ret) 329 { 330 unsigned char *desc = p; 331 unsigned int start = 0; 332 int offset = sdll % XCOPY_SEGMENT_DESC_LEN, rc, ret = 0; 333 334 *sense_ret = TCM_INVALID_PARAMETER_LIST; 335 336 if (offset != 0) { 337 pr_err("XCOPY segment descriptor list length is not" 338 " multiple of %d\n", XCOPY_SEGMENT_DESC_LEN); 339 *sense_ret = TCM_UNSUPPORTED_SEGMENT_DESC_TYPE_CODE; 340 return -EINVAL; 341 } 342 if (sdll > RCR_OP_MAX_SG_DESC_COUNT * XCOPY_SEGMENT_DESC_LEN) { 343 pr_err("XCOPY supports %u segment descriptor(s), sdll: %u too" 344 " large..\n", RCR_OP_MAX_SG_DESC_COUNT, sdll); 345 /* spc4r37 6.4.3.5 SEGMENT DESCRIPTOR LIST LENGTH field */ 346 *sense_ret = TCM_TOO_MANY_SEGMENT_DESCS; 347 return -EINVAL; 348 } 349 350 while (start < sdll) { 351 /* 352 * Check segment descriptor type code for block -> block 353 */ 354 switch (desc[0]) { 355 case 0x02: 356 rc = target_xcopy_parse_segdesc_02(se_cmd, xop, desc); 357 if (rc < 0) 358 goto out; 359 360 ret++; 361 start += XCOPY_SEGMENT_DESC_LEN; 362 desc += XCOPY_SEGMENT_DESC_LEN; 363 break; 364 default: 365 pr_err("XCOPY unsupported segment descriptor" 366 "type: 0x%02x\n", desc[0]); 367 *sense_ret = TCM_UNSUPPORTED_SEGMENT_DESC_TYPE_CODE; 368 goto out; 369 } 370 } 371 372 return ret; 373 374 out: 375 return -EINVAL; 376 } 377 378 /* 379 * Start xcopy_pt ops 380 */ 381 382 struct xcopy_pt_cmd { 383 struct se_cmd se_cmd; 384 struct completion xpt_passthrough_sem; 385 unsigned char sense_buffer[TRANSPORT_SENSE_BUFFER]; 386 }; 387 388 struct se_portal_group xcopy_pt_tpg; 389 static struct se_session xcopy_pt_sess; 390 static struct se_node_acl xcopy_pt_nacl; 391 392 static int xcopy_pt_get_cmd_state(struct se_cmd *se_cmd) 393 { 394 return 0; 395 } 396 397 static void xcopy_pt_undepend_remotedev(struct xcopy_op *xop) 398 { 399 struct se_device *remote_dev; 400 401 if (xop->op_origin == XCOL_SOURCE_RECV_OP) 402 remote_dev = xop->dst_dev; 403 else 404 remote_dev = xop->src_dev; 405 406 pr_debug("Calling configfs_undepend_item for" 407 " remote_dev: %p remote_dev->dev_group: %p\n", 408 remote_dev, &remote_dev->dev_group.cg_item); 409 410 target_undepend_item(&remote_dev->dev_group.cg_item); 411 } 412 413 static void xcopy_pt_release_cmd(struct se_cmd *se_cmd) 414 { 415 struct xcopy_pt_cmd *xpt_cmd = container_of(se_cmd, 416 struct xcopy_pt_cmd, se_cmd); 417 418 kfree(xpt_cmd); 419 } 420 421 static int xcopy_pt_check_stop_free(struct se_cmd *se_cmd) 422 { 423 struct xcopy_pt_cmd *xpt_cmd = container_of(se_cmd, 424 struct xcopy_pt_cmd, se_cmd); 425 426 complete(&xpt_cmd->xpt_passthrough_sem); 427 return 0; 428 } 429 430 static int xcopy_pt_write_pending(struct se_cmd *se_cmd) 431 { 432 return 0; 433 } 434 435 static int xcopy_pt_queue_data_in(struct se_cmd *se_cmd) 436 { 437 return 0; 438 } 439 440 static int xcopy_pt_queue_status(struct se_cmd *se_cmd) 441 { 442 return 0; 443 } 444 445 static const struct target_core_fabric_ops xcopy_pt_tfo = { 446 .fabric_name = "xcopy-pt", 447 .get_cmd_state = xcopy_pt_get_cmd_state, 448 .release_cmd = xcopy_pt_release_cmd, 449 .check_stop_free = xcopy_pt_check_stop_free, 450 .write_pending = xcopy_pt_write_pending, 451 .queue_data_in = xcopy_pt_queue_data_in, 452 .queue_status = xcopy_pt_queue_status, 453 }; 454 455 /* 456 * End xcopy_pt_ops 457 */ 458 459 int target_xcopy_setup_pt(void) 460 { 461 int ret; 462 463 xcopy_wq = alloc_workqueue("xcopy_wq", WQ_MEM_RECLAIM, 0); 464 if (!xcopy_wq) { 465 pr_err("Unable to allocate xcopy_wq\n"); 466 return -ENOMEM; 467 } 468 469 memset(&xcopy_pt_tpg, 0, sizeof(struct se_portal_group)); 470 INIT_LIST_HEAD(&xcopy_pt_tpg.se_tpg_node); 471 INIT_LIST_HEAD(&xcopy_pt_tpg.acl_node_list); 472 INIT_LIST_HEAD(&xcopy_pt_tpg.tpg_sess_list); 473 474 xcopy_pt_tpg.se_tpg_tfo = &xcopy_pt_tfo; 475 476 memset(&xcopy_pt_nacl, 0, sizeof(struct se_node_acl)); 477 INIT_LIST_HEAD(&xcopy_pt_nacl.acl_list); 478 INIT_LIST_HEAD(&xcopy_pt_nacl.acl_sess_list); 479 memset(&xcopy_pt_sess, 0, sizeof(struct se_session)); 480 ret = transport_init_session(&xcopy_pt_sess); 481 if (ret < 0) 482 return ret; 483 484 xcopy_pt_nacl.se_tpg = &xcopy_pt_tpg; 485 xcopy_pt_nacl.nacl_sess = &xcopy_pt_sess; 486 487 xcopy_pt_sess.se_tpg = &xcopy_pt_tpg; 488 xcopy_pt_sess.se_node_acl = &xcopy_pt_nacl; 489 490 return 0; 491 } 492 493 void target_xcopy_release_pt(void) 494 { 495 if (xcopy_wq) 496 destroy_workqueue(xcopy_wq); 497 } 498 499 /* 500 * target_xcopy_setup_pt_cmd - set up a pass-through command 501 * @xpt_cmd: Data structure to initialize. 502 * @xop: Describes the XCOPY operation received from an initiator. 503 * @se_dev: Backend device to associate with @xpt_cmd if 504 * @remote_port == true. 505 * @cdb: SCSI CDB to be copied into @xpt_cmd. 506 * @remote_port: If false, use the LUN through which the XCOPY command has 507 * been received. If true, use @se_dev->xcopy_lun. 508 * @alloc_mem: Whether or not to allocate an SGL list. 509 * 510 * Set up a SCSI command (READ or WRITE) that will be used to execute an 511 * XCOPY command. 512 */ 513 static int target_xcopy_setup_pt_cmd( 514 struct xcopy_pt_cmd *xpt_cmd, 515 struct xcopy_op *xop, 516 struct se_device *se_dev, 517 unsigned char *cdb, 518 bool remote_port, 519 bool alloc_mem) 520 { 521 struct se_cmd *cmd = &xpt_cmd->se_cmd; 522 sense_reason_t sense_rc; 523 int ret = 0, rc; 524 525 /* 526 * Setup LUN+port to honor reservations based upon xop->op_origin for 527 * X-COPY PUSH or X-COPY PULL based upon where the CDB was received. 528 */ 529 if (remote_port) { 530 cmd->se_lun = &se_dev->xcopy_lun; 531 cmd->se_dev = se_dev; 532 } else { 533 cmd->se_lun = xop->xop_se_cmd->se_lun; 534 cmd->se_dev = xop->xop_se_cmd->se_dev; 535 } 536 cmd->se_cmd_flags |= SCF_SE_LUN_CMD; 537 538 cmd->tag = 0; 539 sense_rc = target_setup_cmd_from_cdb(cmd, cdb); 540 if (sense_rc) { 541 ret = -EINVAL; 542 goto out; 543 } 544 545 if (alloc_mem) { 546 rc = target_alloc_sgl(&cmd->t_data_sg, &cmd->t_data_nents, 547 cmd->data_length, false, false); 548 if (rc < 0) { 549 ret = rc; 550 goto out; 551 } 552 /* 553 * Set this bit so that transport_free_pages() allows the 554 * caller to release SGLs + physical memory allocated by 555 * transport_generic_get_mem().. 556 */ 557 cmd->se_cmd_flags |= SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC; 558 } else { 559 /* 560 * Here the previously allocated SGLs for the internal READ 561 * are mapped zero-copy to the internal WRITE. 562 */ 563 sense_rc = transport_generic_map_mem_to_cmd(cmd, 564 xop->xop_data_sg, xop->xop_data_nents, 565 NULL, 0); 566 if (sense_rc) { 567 ret = -EINVAL; 568 goto out; 569 } 570 571 pr_debug("Setup PASSTHROUGH_NOALLOC t_data_sg: %p t_data_nents:" 572 " %u\n", cmd->t_data_sg, cmd->t_data_nents); 573 } 574 575 return 0; 576 577 out: 578 return ret; 579 } 580 581 static int target_xcopy_issue_pt_cmd(struct xcopy_pt_cmd *xpt_cmd) 582 { 583 struct se_cmd *se_cmd = &xpt_cmd->se_cmd; 584 sense_reason_t sense_rc; 585 586 sense_rc = transport_generic_new_cmd(se_cmd); 587 if (sense_rc) 588 return -EINVAL; 589 590 if (se_cmd->data_direction == DMA_TO_DEVICE) 591 target_execute_cmd(se_cmd); 592 593 wait_for_completion_interruptible(&xpt_cmd->xpt_passthrough_sem); 594 595 pr_debug("target_xcopy_issue_pt_cmd(): SCSI status: 0x%02x\n", 596 se_cmd->scsi_status); 597 598 return (se_cmd->scsi_status) ? -EINVAL : 0; 599 } 600 601 static int target_xcopy_read_source( 602 struct se_cmd *ec_cmd, 603 struct xcopy_op *xop, 604 struct se_device *src_dev, 605 sector_t src_lba, 606 u32 src_sectors) 607 { 608 struct xcopy_pt_cmd *xpt_cmd; 609 struct se_cmd *se_cmd; 610 u32 length = (src_sectors * src_dev->dev_attrib.block_size); 611 int rc; 612 unsigned char cdb[16]; 613 bool remote_port = (xop->op_origin == XCOL_DEST_RECV_OP); 614 615 xpt_cmd = kzalloc(sizeof(struct xcopy_pt_cmd), GFP_KERNEL); 616 if (!xpt_cmd) { 617 pr_err("Unable to allocate xcopy_pt_cmd\n"); 618 return -ENOMEM; 619 } 620 init_completion(&xpt_cmd->xpt_passthrough_sem); 621 se_cmd = &xpt_cmd->se_cmd; 622 623 memset(&cdb[0], 0, 16); 624 cdb[0] = READ_16; 625 put_unaligned_be64(src_lba, &cdb[2]); 626 put_unaligned_be32(src_sectors, &cdb[10]); 627 pr_debug("XCOPY: Built READ_16: LBA: %llu Sectors: %u Length: %u\n", 628 (unsigned long long)src_lba, src_sectors, length); 629 630 transport_init_se_cmd(se_cmd, &xcopy_pt_tfo, &xcopy_pt_sess, length, 631 DMA_FROM_DEVICE, 0, &xpt_cmd->sense_buffer[0]); 632 xop->src_pt_cmd = xpt_cmd; 633 634 rc = target_xcopy_setup_pt_cmd(xpt_cmd, xop, src_dev, &cdb[0], 635 remote_port, true); 636 if (rc < 0) { 637 ec_cmd->scsi_status = xpt_cmd->se_cmd.scsi_status; 638 transport_generic_free_cmd(se_cmd, 0); 639 return rc; 640 } 641 642 xop->xop_data_sg = se_cmd->t_data_sg; 643 xop->xop_data_nents = se_cmd->t_data_nents; 644 pr_debug("XCOPY-READ: Saved xop->xop_data_sg: %p, num: %u for READ" 645 " memory\n", xop->xop_data_sg, xop->xop_data_nents); 646 647 rc = target_xcopy_issue_pt_cmd(xpt_cmd); 648 if (rc < 0) { 649 ec_cmd->scsi_status = xpt_cmd->se_cmd.scsi_status; 650 transport_generic_free_cmd(se_cmd, 0); 651 return rc; 652 } 653 /* 654 * Clear off the allocated t_data_sg, that has been saved for 655 * zero-copy WRITE submission reuse in struct xcopy_op.. 656 */ 657 se_cmd->t_data_sg = NULL; 658 se_cmd->t_data_nents = 0; 659 660 return 0; 661 } 662 663 static int target_xcopy_write_destination( 664 struct se_cmd *ec_cmd, 665 struct xcopy_op *xop, 666 struct se_device *dst_dev, 667 sector_t dst_lba, 668 u32 dst_sectors) 669 { 670 struct xcopy_pt_cmd *xpt_cmd; 671 struct se_cmd *se_cmd; 672 u32 length = (dst_sectors * dst_dev->dev_attrib.block_size); 673 int rc; 674 unsigned char cdb[16]; 675 bool remote_port = (xop->op_origin == XCOL_SOURCE_RECV_OP); 676 677 xpt_cmd = kzalloc(sizeof(struct xcopy_pt_cmd), GFP_KERNEL); 678 if (!xpt_cmd) { 679 pr_err("Unable to allocate xcopy_pt_cmd\n"); 680 return -ENOMEM; 681 } 682 init_completion(&xpt_cmd->xpt_passthrough_sem); 683 se_cmd = &xpt_cmd->se_cmd; 684 685 memset(&cdb[0], 0, 16); 686 cdb[0] = WRITE_16; 687 put_unaligned_be64(dst_lba, &cdb[2]); 688 put_unaligned_be32(dst_sectors, &cdb[10]); 689 pr_debug("XCOPY: Built WRITE_16: LBA: %llu Sectors: %u Length: %u\n", 690 (unsigned long long)dst_lba, dst_sectors, length); 691 692 transport_init_se_cmd(se_cmd, &xcopy_pt_tfo, &xcopy_pt_sess, length, 693 DMA_TO_DEVICE, 0, &xpt_cmd->sense_buffer[0]); 694 xop->dst_pt_cmd = xpt_cmd; 695 696 rc = target_xcopy_setup_pt_cmd(xpt_cmd, xop, dst_dev, &cdb[0], 697 remote_port, false); 698 if (rc < 0) { 699 struct se_cmd *src_cmd = &xop->src_pt_cmd->se_cmd; 700 ec_cmd->scsi_status = xpt_cmd->se_cmd.scsi_status; 701 /* 702 * If the failure happened before the t_mem_list hand-off in 703 * target_xcopy_setup_pt_cmd(), Reset memory + clear flag so that 704 * core releases this memory on error during X-COPY WRITE I/O. 705 */ 706 src_cmd->se_cmd_flags &= ~SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC; 707 src_cmd->t_data_sg = xop->xop_data_sg; 708 src_cmd->t_data_nents = xop->xop_data_nents; 709 710 transport_generic_free_cmd(se_cmd, 0); 711 return rc; 712 } 713 714 rc = target_xcopy_issue_pt_cmd(xpt_cmd); 715 if (rc < 0) { 716 ec_cmd->scsi_status = xpt_cmd->se_cmd.scsi_status; 717 se_cmd->se_cmd_flags &= ~SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC; 718 transport_generic_free_cmd(se_cmd, 0); 719 return rc; 720 } 721 722 return 0; 723 } 724 725 static void target_xcopy_do_work(struct work_struct *work) 726 { 727 struct xcopy_op *xop = container_of(work, struct xcopy_op, xop_work); 728 struct se_cmd *ec_cmd = xop->xop_se_cmd; 729 struct se_device *src_dev, *dst_dev; 730 sector_t src_lba, dst_lba, end_lba; 731 unsigned int max_sectors; 732 int rc = 0; 733 unsigned short nolb, cur_nolb, max_nolb, copied_nolb = 0; 734 735 if (target_parse_xcopy_cmd(xop) != TCM_NO_SENSE) 736 goto err_free; 737 738 if (WARN_ON_ONCE(!xop->src_dev) || WARN_ON_ONCE(!xop->dst_dev)) 739 goto err_free; 740 741 src_dev = xop->src_dev; 742 dst_dev = xop->dst_dev; 743 src_lba = xop->src_lba; 744 dst_lba = xop->dst_lba; 745 nolb = xop->nolb; 746 end_lba = src_lba + nolb; 747 /* 748 * Break up XCOPY I/O into hw_max_sectors sized I/O based on the 749 * smallest max_sectors between src_dev + dev_dev, or 750 */ 751 max_sectors = min(src_dev->dev_attrib.hw_max_sectors, 752 dst_dev->dev_attrib.hw_max_sectors); 753 max_sectors = min_t(u32, max_sectors, XCOPY_MAX_SECTORS); 754 755 max_nolb = min_t(u16, max_sectors, ((u16)(~0U))); 756 757 pr_debug("target_xcopy_do_work: nolb: %hu, max_nolb: %hu end_lba: %llu\n", 758 nolb, max_nolb, (unsigned long long)end_lba); 759 pr_debug("target_xcopy_do_work: Starting src_lba: %llu, dst_lba: %llu\n", 760 (unsigned long long)src_lba, (unsigned long long)dst_lba); 761 762 while (src_lba < end_lba) { 763 cur_nolb = min(nolb, max_nolb); 764 765 pr_debug("target_xcopy_do_work: Calling read src_dev: %p src_lba: %llu," 766 " cur_nolb: %hu\n", src_dev, (unsigned long long)src_lba, cur_nolb); 767 768 rc = target_xcopy_read_source(ec_cmd, xop, src_dev, src_lba, cur_nolb); 769 if (rc < 0) 770 goto out; 771 772 src_lba += cur_nolb; 773 pr_debug("target_xcopy_do_work: Incremented READ src_lba to %llu\n", 774 (unsigned long long)src_lba); 775 776 pr_debug("target_xcopy_do_work: Calling write dst_dev: %p dst_lba: %llu," 777 " cur_nolb: %hu\n", dst_dev, (unsigned long long)dst_lba, cur_nolb); 778 779 rc = target_xcopy_write_destination(ec_cmd, xop, dst_dev, 780 dst_lba, cur_nolb); 781 if (rc < 0) { 782 transport_generic_free_cmd(&xop->src_pt_cmd->se_cmd, 0); 783 goto out; 784 } 785 786 dst_lba += cur_nolb; 787 pr_debug("target_xcopy_do_work: Incremented WRITE dst_lba to %llu\n", 788 (unsigned long long)dst_lba); 789 790 copied_nolb += cur_nolb; 791 nolb -= cur_nolb; 792 793 transport_generic_free_cmd(&xop->src_pt_cmd->se_cmd, 0); 794 xop->dst_pt_cmd->se_cmd.se_cmd_flags &= ~SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC; 795 796 transport_generic_free_cmd(&xop->dst_pt_cmd->se_cmd, 0); 797 } 798 799 xcopy_pt_undepend_remotedev(xop); 800 kfree(xop); 801 802 pr_debug("target_xcopy_do_work: Final src_lba: %llu, dst_lba: %llu\n", 803 (unsigned long long)src_lba, (unsigned long long)dst_lba); 804 pr_debug("target_xcopy_do_work: Blocks copied: %hu, Bytes Copied: %u\n", 805 copied_nolb, copied_nolb * dst_dev->dev_attrib.block_size); 806 807 pr_debug("target_xcopy_do_work: Setting X-COPY GOOD status -> sending response\n"); 808 target_complete_cmd(ec_cmd, SAM_STAT_GOOD); 809 return; 810 811 out: 812 xcopy_pt_undepend_remotedev(xop); 813 814 err_free: 815 kfree(xop); 816 /* 817 * Don't override an error scsi status if it has already been set 818 */ 819 if (ec_cmd->scsi_status == SAM_STAT_GOOD) { 820 pr_warn_ratelimited("target_xcopy_do_work: rc: %d, Setting X-COPY" 821 " CHECK_CONDITION -> sending response\n", rc); 822 ec_cmd->scsi_status = SAM_STAT_CHECK_CONDITION; 823 } 824 target_complete_cmd(ec_cmd, ec_cmd->scsi_status); 825 } 826 827 /* 828 * Returns TCM_NO_SENSE upon success or a sense code != TCM_NO_SENSE if parsing 829 * fails. 830 */ 831 static sense_reason_t target_parse_xcopy_cmd(struct xcopy_op *xop) 832 { 833 struct se_cmd *se_cmd = xop->xop_se_cmd; 834 unsigned char *p = NULL, *seg_desc; 835 unsigned int list_id, list_id_usage, sdll, inline_dl; 836 sense_reason_t ret = TCM_INVALID_PARAMETER_LIST; 837 int rc; 838 unsigned short tdll; 839 840 p = transport_kmap_data_sg(se_cmd); 841 if (!p) { 842 pr_err("transport_kmap_data_sg() failed in target_do_xcopy\n"); 843 return TCM_OUT_OF_RESOURCES; 844 } 845 846 list_id = p[0]; 847 list_id_usage = (p[1] & 0x18) >> 3; 848 849 /* 850 * Determine TARGET DESCRIPTOR LIST LENGTH + SEGMENT DESCRIPTOR LIST LENGTH 851 */ 852 tdll = get_unaligned_be16(&p[2]); 853 sdll = get_unaligned_be32(&p[8]); 854 if (tdll + sdll > RCR_OP_MAX_DESC_LIST_LEN) { 855 pr_err("XCOPY descriptor list length %u exceeds maximum %u\n", 856 tdll + sdll, RCR_OP_MAX_DESC_LIST_LEN); 857 ret = TCM_PARAMETER_LIST_LENGTH_ERROR; 858 goto out; 859 } 860 861 inline_dl = get_unaligned_be32(&p[12]); 862 if (inline_dl != 0) { 863 pr_err("XCOPY with non zero inline data length\n"); 864 goto out; 865 } 866 867 if (se_cmd->data_length < (XCOPY_HDR_LEN + tdll + sdll + inline_dl)) { 868 pr_err("XCOPY parameter truncation: data length %u too small " 869 "for tdll: %hu sdll: %u inline_dl: %u\n", 870 se_cmd->data_length, tdll, sdll, inline_dl); 871 ret = TCM_PARAMETER_LIST_LENGTH_ERROR; 872 goto out; 873 } 874 875 pr_debug("Processing XCOPY with list_id: 0x%02x list_id_usage: 0x%02x" 876 " tdll: %hu sdll: %u inline_dl: %u\n", list_id, list_id_usage, 877 tdll, sdll, inline_dl); 878 879 /* 880 * skip over the target descriptors until segment descriptors 881 * have been passed - CSCD ids are needed to determine src and dest. 882 */ 883 seg_desc = &p[16] + tdll; 884 885 rc = target_xcopy_parse_segment_descriptors(se_cmd, xop, seg_desc, 886 sdll, &ret); 887 if (rc <= 0) 888 goto out; 889 890 pr_debug("XCOPY: Processed %d segment descriptors, length: %u\n", rc, 891 rc * XCOPY_SEGMENT_DESC_LEN); 892 893 rc = target_xcopy_parse_target_descriptors(se_cmd, xop, &p[16], tdll, &ret); 894 if (rc <= 0) 895 goto out; 896 897 if (xop->src_dev->dev_attrib.block_size != 898 xop->dst_dev->dev_attrib.block_size) { 899 pr_err("XCOPY: Non matching src_dev block_size: %u + dst_dev" 900 " block_size: %u currently unsupported\n", 901 xop->src_dev->dev_attrib.block_size, 902 xop->dst_dev->dev_attrib.block_size); 903 xcopy_pt_undepend_remotedev(xop); 904 ret = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 905 goto out; 906 } 907 908 pr_debug("XCOPY: Processed %d target descriptors, length: %u\n", rc, 909 rc * XCOPY_TARGET_DESC_LEN); 910 transport_kunmap_data_sg(se_cmd); 911 return TCM_NO_SENSE; 912 913 out: 914 if (p) 915 transport_kunmap_data_sg(se_cmd); 916 return ret; 917 } 918 919 sense_reason_t target_do_xcopy(struct se_cmd *se_cmd) 920 { 921 struct se_device *dev = se_cmd->se_dev; 922 struct xcopy_op *xop; 923 unsigned int sa; 924 925 if (!dev->dev_attrib.emulate_3pc) { 926 pr_err("EXTENDED_COPY operation explicitly disabled\n"); 927 return TCM_UNSUPPORTED_SCSI_OPCODE; 928 } 929 930 sa = se_cmd->t_task_cdb[1] & 0x1f; 931 if (sa != 0x00) { 932 pr_err("EXTENDED_COPY(LID4) not supported\n"); 933 return TCM_UNSUPPORTED_SCSI_OPCODE; 934 } 935 936 if (se_cmd->data_length == 0) { 937 target_complete_cmd(se_cmd, SAM_STAT_GOOD); 938 return TCM_NO_SENSE; 939 } 940 if (se_cmd->data_length < XCOPY_HDR_LEN) { 941 pr_err("XCOPY parameter truncation: length %u < hdr_len %u\n", 942 se_cmd->data_length, XCOPY_HDR_LEN); 943 return TCM_PARAMETER_LIST_LENGTH_ERROR; 944 } 945 946 xop = kzalloc(sizeof(struct xcopy_op), GFP_KERNEL); 947 if (!xop) 948 goto err; 949 xop->xop_se_cmd = se_cmd; 950 INIT_WORK(&xop->xop_work, target_xcopy_do_work); 951 if (WARN_ON_ONCE(!queue_work(xcopy_wq, &xop->xop_work))) 952 goto free; 953 return TCM_NO_SENSE; 954 955 free: 956 kfree(xop); 957 958 err: 959 return TCM_OUT_OF_RESOURCES; 960 } 961 962 static sense_reason_t target_rcr_operating_parameters(struct se_cmd *se_cmd) 963 { 964 unsigned char *p; 965 966 p = transport_kmap_data_sg(se_cmd); 967 if (!p) { 968 pr_err("transport_kmap_data_sg failed in" 969 " target_rcr_operating_parameters\n"); 970 return TCM_OUT_OF_RESOURCES; 971 } 972 973 if (se_cmd->data_length < 54) { 974 pr_err("Receive Copy Results Op Parameters length" 975 " too small: %u\n", se_cmd->data_length); 976 transport_kunmap_data_sg(se_cmd); 977 return TCM_INVALID_CDB_FIELD; 978 } 979 /* 980 * Set SNLID=1 (Supports no List ID) 981 */ 982 p[4] = 0x1; 983 /* 984 * MAXIMUM TARGET DESCRIPTOR COUNT 985 */ 986 put_unaligned_be16(RCR_OP_MAX_TARGET_DESC_COUNT, &p[8]); 987 /* 988 * MAXIMUM SEGMENT DESCRIPTOR COUNT 989 */ 990 put_unaligned_be16(RCR_OP_MAX_SG_DESC_COUNT, &p[10]); 991 /* 992 * MAXIMUM DESCRIPTOR LIST LENGTH 993 */ 994 put_unaligned_be32(RCR_OP_MAX_DESC_LIST_LEN, &p[12]); 995 /* 996 * MAXIMUM SEGMENT LENGTH 997 */ 998 put_unaligned_be32(RCR_OP_MAX_SEGMENT_LEN, &p[16]); 999 /* 1000 * MAXIMUM INLINE DATA LENGTH for SA 0x04 (NOT SUPPORTED) 1001 */ 1002 put_unaligned_be32(0x0, &p[20]); 1003 /* 1004 * HELD DATA LIMIT 1005 */ 1006 put_unaligned_be32(0x0, &p[24]); 1007 /* 1008 * MAXIMUM STREAM DEVICE TRANSFER SIZE 1009 */ 1010 put_unaligned_be32(0x0, &p[28]); 1011 /* 1012 * TOTAL CONCURRENT COPIES 1013 */ 1014 put_unaligned_be16(RCR_OP_TOTAL_CONCURR_COPIES, &p[34]); 1015 /* 1016 * MAXIMUM CONCURRENT COPIES 1017 */ 1018 p[36] = RCR_OP_MAX_CONCURR_COPIES; 1019 /* 1020 * DATA SEGMENT GRANULARITY (log 2) 1021 */ 1022 p[37] = RCR_OP_DATA_SEG_GRAN_LOG2; 1023 /* 1024 * INLINE DATA GRANULARITY log 2) 1025 */ 1026 p[38] = RCR_OP_INLINE_DATA_GRAN_LOG2; 1027 /* 1028 * HELD DATA GRANULARITY 1029 */ 1030 p[39] = RCR_OP_HELD_DATA_GRAN_LOG2; 1031 /* 1032 * IMPLEMENTED DESCRIPTOR LIST LENGTH 1033 */ 1034 p[43] = 0x2; 1035 /* 1036 * List of implemented descriptor type codes (ordered) 1037 */ 1038 p[44] = 0x02; /* Copy Block to Block device */ 1039 p[45] = 0xe4; /* Identification descriptor target descriptor */ 1040 1041 /* 1042 * AVAILABLE DATA (n-3) 1043 */ 1044 put_unaligned_be32(42, &p[0]); 1045 1046 transport_kunmap_data_sg(se_cmd); 1047 target_complete_cmd(se_cmd, GOOD); 1048 1049 return TCM_NO_SENSE; 1050 } 1051 1052 sense_reason_t target_do_receive_copy_results(struct se_cmd *se_cmd) 1053 { 1054 unsigned char *cdb = &se_cmd->t_task_cdb[0]; 1055 int sa = (cdb[1] & 0x1f), list_id = cdb[2]; 1056 sense_reason_t rc = TCM_NO_SENSE; 1057 1058 pr_debug("Entering target_do_receive_copy_results: SA: 0x%02x, List ID:" 1059 " 0x%02x, AL: %u\n", sa, list_id, se_cmd->data_length); 1060 1061 if (list_id != 0) { 1062 pr_err("Receive Copy Results with non zero list identifier" 1063 " not supported\n"); 1064 return TCM_INVALID_CDB_FIELD; 1065 } 1066 1067 switch (sa) { 1068 case RCR_SA_OPERATING_PARAMETERS: 1069 rc = target_rcr_operating_parameters(se_cmd); 1070 break; 1071 case RCR_SA_COPY_STATUS: 1072 case RCR_SA_RECEIVE_DATA: 1073 case RCR_SA_FAILED_SEGMENT_DETAILS: 1074 default: 1075 pr_err("Unsupported SA for receive copy results: 0x%02x\n", sa); 1076 return TCM_INVALID_CDB_FIELD; 1077 } 1078 1079 return rc; 1080 } 1081